APPARATUS AND METHOD FOR CAPTURING AND PROPAGATING CHANGES FROM AN OPERATIONAL DATABASE TO DATA MARTS

摘要

A method for updating a target table of a data mart in response to changes made by a transaction to data stored in a source table of an operational database. Data that was changed in the source table by the transaction is stored in a dynamic image table of a change capture database. Data that was not changed in the source table by the transaction, but which is nevertheless required to be mapped to the target table, is stored in a static image table of the change capture database. The change capture database also contains relevant information regarding the transaction. Once the dynamic and static image tables are properly staged, the changes are propagated from the change capture database to the target tables of the data marts. In other words, data is extracted from the change capture database and subsequently transformed and loaded, thereby minimizing the impact to the operational database. Thereupon, the tables of the change capture database are truncated to discard data which is now no longer needed.